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Energy cost efficiency - SEERS vs same SEERS + additional features

Hi,
I need to replace my AC unit (heat pump (air handler + compressor)) and I live in central florida. I have been wondering if there is, I think there is a difference regarding efficiency but so far I have not seen that information in numbers or a chart, a difference (% of savings) between a 16 SEER unit with Variable Speed and a 16 SEER with 2 stage compressor + variable speed. Basically what is the percentage of savings between 2 units with same SEER but one with 2 stage compressor and the other with just variable speed. The difference in price between both units is very low.
It is worth money wise (savings and spending) to get 2 stage compressor vs only an air handler with variable speed and 1 compressor?